Results 21 to 30 of about 3,194 (299)
Dynamical Model of the Milky Way Using APOGEE and Gaia Data [PDF]
The Astrophysical Journal, 2021 Abstract We construct a dynamical model of the Milky Way disk from a data set that combines Gaia EDR3 and APOGEE data throughout galactocentric radii in the range 5.0 kpc ≤ R ≤ 19.5 kpc. We make use of the spherically aligned Jeans anisotropic method to model the stellar velocities and their velocity dispersions.
Maria Selina Nitschai +4 more
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The dynamical evolution of accreted star clusters in the Milky Way [PDF]
Monthly Notices of the Royal Astronomical Society, 2015 9 pages, 4 figures, accepted for publication in ...
Miholics, Meghan +2 more
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Stellar Bars in Isolated Gas-rich Spiral Galaxies Do Not Slow Down
The Astrophysical Journal, 2023 Elongated bar-like features are ubiquitous in galaxies, occurring at the centers of approximately two-thirds of spiral disks in the nearby Universe. Due to gravitational interactions between the bar and the other components of galaxies, it is expected ...
Angus Beane +8 more
doaj +1 more source
The Rapid Onset of Stellar Bars in the Baryon-dominated Centers of Disk Galaxies
The Astrophysical Journal, 2023 Recent observations of high-redshift galactic disks ( z ≈ 1–3) show a strong negative trend in the dark-matter (DM) fraction f _DM with increasing baryon surface density.
Joss Bland-Hawthorn +3 more
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The escape velocity curve of the Milky Way in modified Newtonian dynamics [PDF]
Monthly Notices of the Royal Astronomical Society, 2017 We determine the escape velocity from the Milky Way (MW) at a range of Galactocentric radii in the context of Modified Newtonian Dynamics (MOND). Due to its non-linear nature, escape is possible if the MW is considered embedded in a constant external gravitational field (EF) from distant objects.
Indranil Banik, Hongsheng Zhao
openaire +4 more sources
Nearly coeval intermediate-age Milky Way star clusters at very different dynamics evolutionary stages [PDF]
, 2019 We report astrophysical properties of 12 Milky Way open clusters located beyond a 2 kpc circle around the Sun by using deep optical photometry. We estimated their age and metallicities on the basis of a maximum likelihood approach using astrometric ...
Dias, Wilton S. +2 more
core +1 more source
Dynamical Modeling of the Milky Way Bugle [PDF]
Proceedings of the International Astronomical Union, 2013 AbstractBulges are commonly believed to form in the dynamical violence of galaxy collisions and mergers. We model the stellar kinematics of the Bulge Radial Velocity Assay (BRAVA) and find no sign that the Milky Way contains a classical bulge formed by scrambling pre-existing disks of stars in major mergers.
openaire +1 more source
The Imprint of Clump Formation at High Redshift. II. The Chemistry of the Bulge
The Astrophysical Journal, 2023 In Paper I, we showed that clumps in high-redshift galaxies, having a high star formation rate density (Σ _SFR ), produce disks with two tracks in the [Fe/H]–[ α /Fe] chemical space, similar to that of the Milky Way’s (MW’s) thin+thick disks.
Victor P. Debattista +13 more
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Dynamical Models for the Milky Way
, 1996 The only way to map the Galaxy's gravitational potential $Φ({\bf x})$ and the distribution of matter that produces it is by modelling the dynamics of stars and gas. Observations of the kinematics of gas provide key information about gradients of $Φ$ within the plane, but little information about the structure of $Φ$ out of the plane. Traditional Galaxy
Dehnen, W, Binney, J
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The Milky Way - Our Home in the Universe
, 2018 Aakasha Ganga, Via Lactea or the Milky Way is our home in the Universe. The discovery of the telescope by Galileo Galilei had facilitated the sky watchers to notice a variety of geometrical forms in the sky.
Divakara Mayya
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